post https://api.miro.com/v2/boards//items/bulk
Adds different types of items to a board. You can add up to 20 items of the same or different type per create call. For example, you can create 3 shape items, 4 card items, and 5 sticky notes in one create call. The bulk create operation is transactional. If any item's create operation fails, the create operation for all the remaining items also fails, and none of the items will be created.
To try out this API in our documentation:
1. In the BODY PARAMS section, scroll down until you see ADD OBJECT (Figure 1).
Figure 1. Add object user interface in readme
2. Click ADD OBJECT, and then select or enter the appropriate values for parameters of the item that you want to add.
3. Repeat steps 1 and 2 for each item that you want to add.